Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “guinea pig”

See all translations

guinea pig

noun [C]  /ˈɡɪn·i ˌpɪɡ/ us  
a small, furry animal with rounded ears, short legs, and no tail, often kept as a pet and for use in scientific experiments fig. A guinea pig is also a person used in a test, esp. one to discover how effective a new drug or process is: Her own son accused her of having used him as a guinea pig to test her theories about the education of children.
(Definition of guinea pig from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of guinea pig?
Add Cambridge dictionaries to your browser to your website

Definitions of “guinea pig” in other dictionaries

Word of the Day

piglet

a baby pig

Word of the Day

I won’t tolerate it! Replacing formal words with phrasal verbs.

by Liz Walter,
April 01, 2015
When you are using a language, it is important to understand if a word is formal or informal, so that you can use it in an appropriate way. You might hear people saying dosh for money, or spud for potato, but they wouldn’t write those words in a formal essay. Similarly, a

Read More 

stackin’ p

March 30, 2015
idiom slang earning a lot of money ‘That’s a very generous present.”Yeah, well, she’s stackin’ p, innit?’

Read More